Thank you! Good point about the heat. I’ll give it a try for that price. I managed to get rid of the click by surgery, cutting and spreading out the teeth on either side of the crack with an exacto and adding some superglue. It is still a little noisy but less of a defined click.
Clear. @Valentin : is this one part of the family? Indicated by number 223, it is the same clutch as the EX66, EX77, EX88, and FX707: X-3362-554-1, CLUTCH ASSY?
EX60 and EX70 clearly no, see picture attached. Circled part is not the clutch, picture was marked for a different thread. And same applies to the rest of the series mentioned to have #223 clutch marked on diagram.
Thank you. Less to worry about. I have not yet checked the integrity of the gears of the EX60 mechanism. Still waiting for packages from three different parts suppliers. When I have all this in hand, I unsolder the circuit board and carefully check the gears, cam mechanism, levers, etc. I will also lubricate the capstans, replace the pinch rollers and the drive belt. I'm not sure if I want to do anything with this brushless motor. It seems to me that its body is well sealed on all sides. Therefore, getting to its insides for cleaning and lubrication is clearly not easy.
In regard to the motor, the design is similar to the one presented in this thread: https://stereo2go.com/forums/threads/how-to-diassemble-and-lubricate-sony-wm-ex-fx-gx-motor.7940/, but with a cover like this one https://stereo2go.com/forums/thread...-type-motor-in-sony-walkmans.7943/#post-59754. It's easier than it looks to open: heating the case with a soldering iron will soften that glue and then it can be removed with a pair of tweezers. Will add pictures with it on the thread with EX motors. Think it's worth lubricating it.
Hi Valentin, my gear arrived, it was pretty flat but I gave it some gentle manipulation. Any glue recommendations for this? Superglue? Thank you.
Liquid type super glue is what I have used. But before you glue make sure you note the right orientation of the gear.
Ok, thank you. I will double check orientation. Are you talking the plastic gear totally flipped or does it need to go into the alignment holes a certain way?
Am talking about the gear not being totally flipped, because it can be installed on both sides of the metal disc but only one side is correct.
I found this on Aliexpress. I haven’t bought because I don’t need one but thought it may help others. Gear for Sony Wm-ex2000ex921gx654 Gx651ex67ex655fx688fx877 cassette walkman player https://a.aliexpress.com/_msw3WSs
will add some of those to my next order see if they will fit and work correctly. @Valentin EX600 is missing from your list
I have purchased 2 of those from aliexpress and tried on 2 units, wm-ex652 and wm-ex668. So 652 was in "worse" condition overall compared to wm-ex668, but it was just clicking compared to wm-ex668 which was not managing to engage the head because the crack was bigger so the gear was stuck. First, I didnt have to glue anything, the gears were tightly snapping on the metal disk with all of the cuts/notches properly and evenly in place. I am reading this post here and the only thing that I didnt do to any of the units was lubricating the motor. On both I have cleaned capstans, and oiled them close to the flywheel, made sure washers close to flywheel were in place etc. And even 652 was obviously heavily used compared to 668 which was like unused based on the housing, head, pinch rollers, battery contacts etc, when I measured speed and w&f, both units showed difference when using HPR test tapes between ff and rew playback. Speed difference was 0,8-0,9% while w&f was on one side around 0,25%wrms and rew side around 0,35% wrms. I am sure that the tape is good as I can measure 0,038% wrms on Technics RS-B755 on both sides of the cassette. I am wondering if there is something that I did wrong (or missed to do), or the clutch gear is bad or something else considering this high w&f
For EX652/EX668 the mentioned W&F of 0.35% WRMS/0.25% WRMS isn't actually that bad. What you can do to make it lower is check if the clutch teeth engagement is clean all the way round, meaning no points there the 2 gears don't have any clearance between the teeth. Clutch gear itself can have an impact on W&F if there are points of uneven engagement on its circumference. Then of course belts and rollers are other factors influencing W&F. Belts can be a hit & miss, seen some belts from same batches to have double the W&F of others. If you think you can lubricate the motor without damaging it, that's something I would also do. But don't expect to see major imporvements from that alone. Does the gear have any periodic gear noise when the unit is running ? What gear are you reffering to exactly ? The very cheap ones are a hit & miss, wasn't too happy with those. Recently found one that I like more here: https://www.goofish.com/item?&id=848939392028.
I ordered https://a.aliexpress.com/_msw3WSs from the previous post, and I have not noticed any unevenness in the clearance between the teeth. At least not with a bare eye and when I mounted it on the shaft and moving with the finger. Pinch rollers looks fine and clean on both units, and also, for both units, I have ordered the belts from Marian as I always order belts from him. I have also saw your post about lubricating motor and I think I will skip that part as you mentioned no major gain + I dont hear any weird noise from the mech including motor and gears. Both units are pretty silent in the playback mode. Btw, the gear you posted from goofish (first time I see this site, is it any better than ali or other chinese sites for such parts?) looks exactly like the one I bought form aliexpress, no glue needed also, just snaps with the notches on the metal disk and it is really a good fit, not light to mount but also does not require huge force.
Yes indeed the one in your link seems the same as the one on goofish. Wasn't aware it's available on Aliexpress also. And yes the one on goofish is a snap fit, doesn't require any glue. Regarding the motor, the main benefit is long-term wear rather than an immediate significant drop in W&F. But it is one of the tricker motors to open, hence why it's up to everyone to decide. Belts from Marian do exhibit what I stated, so trying 3-4 different belts of same size is something worth trying but not a guarantee it will solve the higher W&F. One other aspect that has to be taken into consideration is capstan bushing wear. This will directly impact W&F because it will create a higher amplitude, low frequency resonance. When those bushings wear and there's significant play, the W&F will naturally increase and there's really nothing that will solve it apart from changing the mechanism chassis (different bushings). The unfortunate part is wear on capstan bushings is common on these units, hence why a W&F of 0.35%/0.25% isn't actually that bad. It's more the FWD one that's the problem, but that is caused by fact that flywheel is driving the geartrain. Wear on the drive gear there also exacerbates W&F. Thing is lowering the W&F in such cases may require donor unit(s): capstan bearings and flywheels cannot be replaced without a donor.
